A second earthquake—magnitude 7.4—has hit northeastern Japan, prompting a tsunami warning. The quake, strong enough to move buildings in Tokyo, hit 78 miles north of the devastated Fukushima plant at 11:32 pm, local time.

Update 1: TEPCO officials say they've not encountered any further problems with Fukushima's six reactors in the aftermath of this newest quake, although the area has been hit by electrical blackouts.

Update 2: Residents of the Miyagi Prefecture have been told to move to higher ground immediately in advance of an expected tsunami.

Update 3: Authorities at Miyagi's Onagawa nuclear plant say no elevated radiation levels have been detected around the facility, the reactors of which were shut down after the original March 11th quake.

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Update 4: Electrical blackouts are being reported in the vicinity of the quake's epicenter as well.

Update 5: A Japanese government spokesperson says tsunami waves are expected to have already hit land, although none have been observed.

Update 6: Six injuries have been reported so far by local fire departments.

Update 7: Water injection at the Fukushima plant has continued despite the latest tremor.